Injection Moulding Technique is a powerful therapeutic option in the restorative field, aiming to improve the aesthetics and function of teeth. It is a repeatable and predictable technique, which requires a direct/indirect procedure to transform the digital tooth design and the wax-up (analog or digital) into a definitive composite restoration. The author has developed the technique in an innovative way with the help of a new index dedicated to the injection procedure and called Customised Hybrid Index, published in the IJED 2025 n1. The technique requires the use of flowable composites or thermoviscous composites and allows the restoration of the shape, surface and texture of the elements by replicating shapes defined in the laboratory through accurate waxing and tested with mock-ups before being injected. The classic field of application is the adhesive restorative, especially in additive cases (e.g. diastemas, erosion/abrasion, etc.) from single restorations or of some frontal elements up to full mouth adhesive rehabilitation. However, the technique also becomes strategic in orthodontic cases in order to define the final volumes before orthodontic movements. A last option developed by the author is the application of the injection technique in periodontal cases, even serious ones, with significant loss of periodontal support; in these cases, after an adequate surgical or non-surgical periodontal therapy, it is possible to re-establish adequate shapes by closing black triangles and possibly splinting together the elements with significant mobility. It is therefore clear that the fields of application are truly numerous and the technique, as developed, constitutes an extraordinary therapeutic opportunity in an increasingly conservative and minimally invasive perspective.